Cylinder-lock.



No. 657,665. Patented Sept. Il, |900. E. von MARsvszKv.

CYLINDER LOCK.

(Application filed Dec. 3, 1897.)

(No Model.) 8 Sheefs-Shet l.

WILEEEEE A Inval-inl' rma/2 WMM WM a Z 6/ K 4; l

R s Patins no, PuoTo-Lrruo, wAsHlNuToN u c No. 657,665. I Patented Sept. -I|, |900. E.- voN MAnsvszKY.

CYLINDER LOCK.

(Application filed Dec. 3, 1897.)

WMM/7,17 N 4%@ YN: man@ ravens co rnootrrno.. wwmaon. D. c. v

V Patented Sept. Il, |900. E. von mAsvszKY.

CYLINDER LOCK.

(Application led Dec. 8, 1897.)

8 Sheets-Sheet 3.

(No Model.)

' WEESEEE fm/,41% www@ u c. me ummm mns co., wmom'na. wAsHmoYoN CYLINDER LOCK.

(Application led Dec. 3, 1897.)

' Patented sept. n, |900. E. von MARsvszKY.

TN: nonms PETERS co.. Pnomumol. wAsmNGmN. I74 c.

gg Sheets-Sheet 5.

Patentd Sept. Il, |900.

CYLINDER LUCK (Application led Dec. 3, 1897.)

E. von MARsvszKY.

(No Modal.)

55 S WM5/0MM No. 657,665. Patented Sept. Il, |900. E. VON MARSOVSZKY.

LlNl'JEf LOCK.

ization filed Dec. 3, 1897.) (No Model.) 8 Sheets-Sheet 6.

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No. 657,665. Patented Sept. Il, |900.

E. VGN MARSOVSZKY CYLINDER LUCK.

(Application H led Dec. 3, 1897.)

8 Sheets-Sheet 7 (No Model.)

W'I-n a 5 5 a 5 fam/24% :K0/Marra No. 657,665. Patented Sept. ll,` |900.

' E. von MAnsvszKY.

CYLINDER LGK.v (Application filed Dec 3, -1897.) (No Model.) 8 Sheets-Sheet 8.

cw al@ @w g' y@ W''nassas IgE/'antw @WVM 4% W W7 r YH: CHRIS N n C Unirse STATES PATENT rrrrcn.

FMERICH` MARSVSZKY, OF BUDA-PESTH, AUSTRIA-HUNGARY.

CYLINDER-LOCK.

SPECIFICATIO forming part of Letters Patent No. 657,665, dated September 11, 1900` Application filed December 3, 1897. Serial No. 660,692. .No model.)

o @ZZ whom, t :1t/.ty concern,.-

Beit known that I, EnnRrcH voN Mnnsv- SZKY, a subjectof the Emperor of Austria- Hungary, and a resident'of Buda-Pesth, Austria-Hungary, have invented certain new and useful Improvements in Cylinder-Locks, of which the following is a full, clear, and exact description.

The present invention relates to locks, particularly that class of locks which are applied to doors, cash-boxes, furniture and railway carriages, and closed trucks.

The invention consists of a lock comprising a series of superposed cylinders and turnblers in connection therewith and a key having a separable or divided bit, the parts of said bit being separated after the key has been inserted in the lock and each part acting to op erate one cylinder, the said bit-sections being again locked together as the key is withdrawn. The construction of the key-bit is such that neither the locking mechanism for its constituent parts nor the nature of the mechanism in the lock for locking and unlocking the said parts are visible exterior-ly, norcan the bit-sections be separated without the cooperation of the lockfcylinders, as will be hereinafter particularly described.

In order to render the present specification more easily intelligible, reference is had to the accompanying sheet of drawings, in which similar letters of reference denote similar parts throughout the several Views.

Figures 1 to 13, Sheet 1, represent the construction of the key, Fig. 1 beinga side elevation of the key, Fig. 2 a similarelevation seen from theopposile side, Fig. 3an end elevation, Fig. 4 a view seen t'ronr underneath, Fig. 5 a vertical section through the composite bit, Fig. G a central cross-section in the vertical plane through the said bit, Fig; 7 a side elevation of the bitwith the lower section detached and swung around on the key-shaft, Fig. 8 a si nrilar elevation with all the sections detached and swung around, as also slid lorrgitudinally along the key-shaft, Fig. 9 a plan of Fig. 3, Fig. 10 a horizontal section through the middle bitfscction, Fig. 1l a View of the middle key or bit section seen from the upper side, Fig. l2 a similar View of the same section seen from underneath, and Fig. 13 a .horizontal section through the lower bit-section. Figs. 14 to 19, inclusive, show the gerreral construction of the lock, Fig. 1.4 being a plan oi' the lock, Fig. l5 a side elevation ofthe same, Fig. 16 a vertical section on line 16 16 of Fig. 14, Fig. 17 a similar section on line 17 17 of Fig. 14, Fig. 13 a similar section on line 18 18 of Fig. 14, and Fig. 19 a similar section on line 19 19 of Fig. 14. Figs. 2O to 34, inclusive, show in various elevations and sections the construction of the various cylinders. In the present case three are shown; but the number may be varied, as also the number of the bit-sections. Fig. 20is aplan of the top or front cylinder; Fig. 2l, a side elevation of the same. Fig. 22 is a view of the same cylinder seen from underneath; Fig. 23, a plan of the middle cylinder; Fig. 24, a cross-section of the same on line 24 24 of Fig. 23; Fig. 25, a similar section on line 26 26 of Fig. 23; Fig. 26, a similar section on line 25 of Fig. 23; Fig. 27, a view of the same cylinder seen from underneath. Fig. 23 isa plan of the lower cylinder carrying the bolt. Fig. 29 is a cross-section of the same on line 29 29, Fig. 28; Fig. 30, a similarI section on line 30 30, Fig. 28. Fig. 3l is a plan of the base-plate of the lock; Fig. 32, a cross-section on line 32 32, Fig. 3l; Fig. 33, a side elevation of the said plate, and Fig. 34 a View of the same seen from underneath. Figs. 35 to 42 are a series of plans andv vertical sections showing the position of the partsof the lock when the key isplaced therein at various points in the passage performed bythe key to open the lock. Fig. 35 lis a plan showing the key in the position it has attained after having been turned from the keyhole to L2, Fig. 39, and from L2 to K. At a point intermediate of the tWo latter points the lower key-bit section has been detached, while the nriddle and vupper" sections are still connected and lie in the line K L of Fig. Fig. 36 is a vertical section on line 3b 3G of-Fig. 35. Fig. 37 is a plan showing the position of the key after the same has been turned to the point K', at which point the latch retaining the middle and upper sections has been thrown back and the locking-pin for the two sections disengaged, so that these two sections have now also been separated and the second cylinder may be operated. Fig. 33 is a' vertical section on line 38 38 of Fig. 37.

IOO

Fig. 39 is a plan showing the passage of the upper bit-section from the point K' of Fig. 37 to the point K2 of Fig. 39, the latch being thrown back and its fingers operating to throw out of engagement the tumblers of the middle cylinder. Fig. 40 is a section on line 4.0 40 of Fig. 39. Fig. t1 is a plan showing the upper bit-section on the li'ne L3 K3 or in the position to open the lock, and Fig. 42 is a section on line 42 42 of Fig. 4l.

In the drawings I have illustrated a forni of my invention involving a key having a bit composed of three sections, the lock being provided with three cylinders; but I do not wish the invention to be confined to the particular number of bit-sections and cylinders, as these may be increased or decreased by means of simple mechanical contrivances patent to any one skilled in the art.

The lock illustrated comprises the following main points: First, a key having a bit comprising three sections; second, the latch in connection with a middle section; third, a lock having a bolt-operating cylinder and bit-operating cylinders, and, fourth, means for closing the keyhole.

First. The construction of the key- The shaft 7c is provided with a suitable handle and with an upper bit-section k', rigidly attached thereto,a middle section k2,pivotall y mounted on a reduced diameter at the forward end of said shaft, and lower or forward bit 7c3, also mounted on said shaft, the latter two bit-sections being capable of longitudinal movement on said shaft and being prevented from detachment from same by means of a head h4, formed at the en d of the said shaft. The lower surface of theupper bit-section k is provided with a series of borings a, varying in depth, Figs. 5 and 6, said borings corre.q sponding in depth and diameter' to aseries of pins q, Fig. 18, mounted in the bolt-cylinder cl and capable of depressing a series of springpressed bolts fr, having springs r4, and thus releasing the said bolt-cylinder, as hereinafter set forth.A The shape and depth of the borings z, Fig. 5, are concealed from View in the key by means of the intermediate bitsection k2, which is pivotally mounted on the reduced part of the shaft tof the key. A third section k3 is mounted on the saidshaft below the said second section. A detent-bolt r? is mounted at about the outer end of the intermediate section 792, said boltjieingnormally depressed by means of a spring r2 and heilig retained in the end depression z of the section k' by the upper surface of the under section k3 when the key is not in the lock. As soon as the under section 7c3 has beensepa.- rated from the middle section 7a2 by the action of the lock-cylinder the bolt r3 will be depressed by the spring r2 by means. of a groove, hereinafter described, after the said key shall have been turned a certain part of the revolution. The spring-bolt r3 is concealed by the under section k3 when the key is not in the lock. The lower section its is inders b, c, and d.

coupled to the middle section k2 by means of a series of spring-bolts r', which engage in a corresponding series of verticalborings of the said lower bit-section, depressing a corresponding series of bolts q of varying length, the reduced ends of which bolts q' are Visible through openings in the under surface of the said lower bit-section. The bolts r are normally depressed by means of springs m, mounted above the same in the middle section k2. If the bolts or pins are by any means pressed upwardly, so as to cause the ends of bolts r' to be in alinement with the line of section between bit-sections 7a2 7c3, the latter will be released from the former. When this has taken place and provided that no means are present to retain the spring-bolt r3 in its upward position, the latter would be nor mally depressed and accordingly disengage the upper fixed bit-section k from the said middle section. If now the key-shaft 7c, and with it the upper section 7e', 'is turned far enough to bring the latter out of engagement with the section k2, this, and with it the lower section-k3, will slide along the key-shaft la into planes approximate that of the fixed bit 7c. This is, in fact, the position of the bit-sections when operating to open thelock, Figs. Saud 9. In order to effectually close the cre-vices between the bit-sections, the lower edges of sections t k2 are provided with chamfers h b2, respectively, Figs. 6, 7, and 8, which engage corresponding recesses g g2 of sections 7e3 k2, Figs. 9 and 11.

Second. The latch on sectz'on7c2.-Tl1e latch a; is pivoted on a b ar cx, mounted on lugs m2 of the middle bit-section k2, and its lower end is concealed in a small housing y, fast on the lower bit-section 7c3, said housing serving mainly to conceal a series of hooked fingers x3 at the lower end of the4 said latch and for disengaging said fingers from a series of tumblers or sliding bolts, as hereinafter described, Figs. 6, 11, and l2. When the housing y is in position over the ends of the fingers x3, a ledge.v m5, Fig. 7, of said housing engages in the hook-shaped recess at, Fig. 8, of the iingers and conceals their form. The projections p p, Figs.- 8, 9, and l1, engage the corz responding recess on the section c/ to guide the same intoproper position against the midf die section k2.

By means of the bolts q, which fit the orifices in the ends of the lowest bit,

. and the latch 00 the connections between the bit-sections are so concealed and the. latter so: coupled that it is impossible to separate the parts even when the section 7c and the button 7a4 of the reduced part of the shaft 7c may havebeen detached by means of a chisel or other tool.

T hr1-rd. T he rlock with bolt and hit operating cylinders.-'llhe lock consists of the cylindrical housing a, having base-plate e, cover a, with keyhole and keyhole-cover, hereinafter described, and in this case three cyl- The cover ct is screwed to the housing a at 'y' and is provided with IIO thekeyhole l Z. In the housing c' are mounted the superposed cylinders b, c, and d. As will be seen from the drawing described in connection with the key, the bit-sections It' k2 7c3 are connected to the shaft by means of curved or bow-like arms corresponding in shape to that part. of the key-orifice which connects the orifice Z with the lower part of the orifice I', so that in all the cylinders the nose fa, Figs. 20 to 27, will extend into the keyhole and prevent an examination of the interior of the lock through the hole Z. The head 7a4 and the shaft of the key 7c will be inserted into the hole Z, while the bit., comprising the three sections It" 7.52 k3, will enter the extension Z' of the keyhole. In the immediate proximity oi' the oriiice l a cavity s t is formed on the under surface of the cylinder l), Figs. 16 to 22, the cross-section of said cavity corresponding to the shape of the latch x, so that the latter can pass into the cavity when the bit has been suflciently far inserted -into the lock. The cavity s t extends radially, the part s being gradually flattened or made lower, and as soon as the latch x meets this lower part s of the cavity it will be turned on its pivot ax. The lower surface of the cylinder Z) is further provided with a radial depression having various sectional areas w w 102, iu which the tumblers e of the intermediate cylinder c may move.

The intermediate cylinder c, Figs. 16 to 19 and 23 to 27, is provided at its under surface with a recess o3 for the reception of the hous-` ing y on the bit-section k3. The keyhole in the cylinder c, Figs. 23 and 27, is extended or widened, and the ends of the tumhlers n extend into the widened part of the same. These tumblers are operated by the lingers 51:3 of the latch and forced backward when the latter is turned on its pivot ctx. The hooks fu v2 of the sliding` tumblers i) engage successively in the radial groove w tu' 102 of the cylinder l), which groove, as above mentioned,

is provided with varying cross-sections, sol that each part of the said groove will correpin cui, Fig. 19, is mounted which engages in a groove o, provided in the bolt-cylinder d.

The bolt-cylinder d having bolt, hook, or catch t, Figs. 1o' to 19 and 28 to 30, is provided with the key-orifice extension Z. Instead ot' the part Z ofthe keyhole a deep groove n', corresponding to the shape of the bit-section 7.53, is provided, said groove containinga series of pins n, adapted on contact with the pins q to press the latter upwardly The cylinder c is further provided with` into the bit-section 7.53. Another groove i3, similarly inclined tothe groove e in the cylinder e and becoming gradually fiat-tened, is provided in the cylinder d, Fig 28, said groove being recessed at t in order to guide the spring-pressed pin The cylinder d is further provided with a series of bolts, by means of which it is locked to the base-plate e. The detent-bolts proper,r which 'are operated by the said bolts q, are mounted in the base-plate e and extend into borings of t-he bolt-cylinder d, in which the said bolts q are mounted. The bolts q correspond in position to the boi-ings .e of the bit-section la', and their ends extend into a cavity p', formed in the upper surface of the said cylinder d. The cylinder d is locked, as before mentioned, to the base-plate e, Figs. 1G to 19 and 31 to 3l.

The projections or lugs 7'2 of the base-plate fit into recesses j, Fig. 36, of the housing ed, and the said base-plate may be further secured tothe cylinder-walls of the housing by means of screws. The base-plate e forms the closure for the part Zot' the keyhole, being provided with a depression only deep enough to receive the head 7c4 of the key-shaft. The series of bolts r, mounted in this plate and which, as previously mentioned, serve to lock the bolt-cylinder d, are normally pressed upwardly by means of springs r4, mounted on a spindle fitted in a recess inthe under surface of the said base-plate.

When the lock is locked, the cylinders I) c d and the base-plate care in the following positions: The detent-bolts r of the base-plate e are in engagement with the bolt-cyliuder-(Z and prevent the same from rotation. At the same time the sliding bolts q of the bolt-cylinder d are covered and edectually concealed by the cylinder c. The orifice ml of the cylinder c is not in position above thefrecessp'. The tumblers c are in position in the opening Z on the cylinder c and prevent the movement of the hooks/U' c2 in the groove/w lzu' '1122. The orifice 'm' may be brought into position above the recess p' by turning the cylinders caud b; but the said opening will still be concealed by the cylinder b. Not until the latch has disengaged the tumblers fn can 1 he bit-section k' by rotating the cylinders d and c be passed from the cylinder b to the orifice m and to the recess p'.

In locking the lock the latter and the key coperate in the following manner: 'lhe key is passed into the orifices Z Z ofthe cylinders b and c far enough to allow the whole composite bit to reach the cylinder d. If' new both the cylinders are turned, the bit 7c k2 k3 will be turned to the position indicated by the line 30 30 of Fig. 28. At this point the lowest bit-section 7c3 will enter the recess n of the cylinder d, and the pinsn in the recess will engage the ends of the bolts q' of' the key, pressing the same upwardly, and thus raising the bolts 1" sulliciently high in the section 7a2 to detach the latter t'rom the lower sectionv k3. The middle section 7a2 is, however, still iOO llO

coupled, by means of the latch fr and thel spring-bolt r3, to the upper section 7a', while the lower section 7c3 will remain tixed in the recess n'. If now the key is turned further, the cylinders andv c will rotate with the same. When the sections 7c 7.62 have been turned to the position indicated by the line K L, Fig. 35, the latch ai comes into operation. The position just described is illustrated in Figs. 37 and 38 in plan and section. In these views the cylinders b and c are in the same position, one about the other, asin Fig. 35 along the line KL. The bit-sections lo 7a2 are still coupled, owing to the fact that the spring-bolt r3 has not yet reached the deepest point of the inclined groove t. A moment afterward the said bolt r3 will be enabled, by means of the groove, to move downr ward far enough to pass ont of the section 7c',

and at this point the intermediate cylinder c will remain stationary, since the pin 0 has attained the end of the concentric groove o in the upper surface of the cylinder d, Figs. 28 and 29. The bitsection 7c is now uncoupled from the section 7a2, and on continuing to turn the key the former section 7c alone will eect the further rotation of the cylinder b as long as the hooks o c2 remain in the section H H', Figs. 35 and 39, of the groove w w 102. The tumblers o can only be operated by the latch and as long as this latch is in the enlarged part of the groove S1,Figs.37 and 38, the same will be in a substantial vertical position and will not infiuence the said tumblersc. When the bit-section 7a has reached the posi- "N-tieln indicated by the line L K of Fig. 37, the

groove t will have been turned far enough to the right to cause its decreased sectionto operate the latch cv, tipping the same on its pivot by means of the edge t2. The further rotation of the key operates the fingers x3 against the ends of the tumblers c, causing the hooks o o2 of the same to be forced outwardly, so that the same Jmay now pass into the section H H2 of the groove w of the cylinder b,along which groove they will now pass. They must not, however, enter the groove .w before the keyhole of the cylinder d has passed off that of the cylinder c entirely. (See t-he position indicated by line K L of Fig. 37.) If the section 7c is further turned from the position indicated by line L2 K2, Fig. 39, the cylinder b will move with it, because the hooks c o2 can now move in vthe part 'L02 of the groove w w wz. The orifice m of the cylinder c will now register with the recess p' of the bolt-cylinder d. When the bit-section 7c has arrived at the position indicated by the line K3 L3 of Fig. 41, the said section may be pushed through the orifice WL into the recess p. Y When this is the case, the bolts q may enter the borings .a on the lower surface of the bit-section 7d, by which section they will be depressed, thus pushing the detent-bolts r of the base-plate e out of the borings of the bolt-cylindercl. The latter is vnow free to rotate. The three bit-sections 7c 7a2 7c3 will now be in the position indicated at Figs. 8 and 9, and the bolt-cylinder CZ may be turned either by means of the key or by means of the bolt g, thus disengaging the latter and enabling the door to be opened.

It should be remarked that the section 7c3 is retained in the cylinder d and the section k2 in the cylinder c'. The grooves Z3 and t serve to guide the detent-bolts r and the spring-bolt r3, respectively. The groove e forms the guide for the bit-section 7c'. In turning the key back the bit-section 7c is iirst withdrawn from the oriiice fm and recess p and then turned backward in the recess or depression c, Fig.V 23. The section will then recouple with the section 7a2, and at the same time or immediately afterward the latch fr will begin to move into its vertical position. On continuing to turn the key back the sections 7c' 7a2 will move together, the inclined groove t will press the'spring-bolt r3 back into the section 7c', and at the same time the spring-bolts r' will be pushed home in the section k2 by the inclined groove 3, so that the lower section 7c3 will be able to be turned into position against the section k2. If the cylinder cl has not been turned back far enough to allow the detent-bolts r and the bolts q to come into alinement, the key may be withd rawn from the lock without locking the door. The lock will not be closed until the bolts r have been brought into alinement with the bolts q either by turning the boltcylinder CZ by means of the key or by means of the bolt g.

Fourth. The device for covering the keyhoZe.-The device for covering the keyhole is illustrated in Figs. 14 to 19 and consists of a cover F, having va handle F' and having arms B, Figs. 14 to 19, pivotally attached to hinge-pin C, which is mounted in a block A of the lock cover or cap d. The said cover is provided with downwardly extending ledges P, between which a rubber disk or disk of other yielding material F3 is secured, said disk serving to tightly close the keyhole. The cover F is retained in position by means of a lever Gr, pivoted at G2, Fig. 14, and adapted to engage under a hook G on the lockcover. In order to prevent the cover F from being opened by unauthorized persons, a strip of paper,linen,leather,or the like may be stretched over the same. The strip is attached to the hook E, Fig. 18, and drawn over the cover and over an orifice in the same, in which the bolt D fits. After the loc-k has been closed the pin D may be passed through the strip into its orifice, when a laterally-v sliding spring-pressed bolt o with spring o2 will advance into a recess D of the said pin D, retaining same in position. On opening the lock when the cylinder (Z is turned the bolt o will be turned out of the recess ot' the pin D, and the latter will be raised by means of a screw-like rib m2, formed around the ,cylinder b. The bolt-cylinder may be arranged in any desired manner.

The lock may be attached to the car or truck or doorframe, dzc., in any suitable way-for instance, by means of bolts t', attached to the cap c, and which may be passed through the wall ofthe car. These bolts may be secured on the interiorof the car by means of a ring ft2 and nuts t.

The bolt g may be caused to engage a suitable orifice in a locking-plate or to act in any other known manner in connection with the wall to which the door is to be locked, or if the lock is on the wall then the bolt may engage a suitable orifice of the door, as will be evident without further explanation.

l claim as my inventionl. In a lock the combination of a key, having separable bit consisting of a series of sections, means for locking said sections together, a series of superposed cylinders in said lock and means in connection with the same for disengaging the bit-sections when the lock is opened and relooking the same when the lock is closed,doorfastening means, being attached to one of said lock-cylinders, substantially as described.

2. In a lock the combination of a cylindrical housing, having a base plate and having therein a seriesof superposed cylinders and a bolt fast on one of said cylinders, a key, having a composite bit, one section of which is fast to the key-shaft and bit-sections pivotally mounted on said key-shaft, means concealed within said bit for locking the sections together and means in connection with lockcylinders for unlocking said bit-sections and for releasing the bolt-cylinder after said sections have been disengaged and for relocking said sections before the key has left the lock, substantially as described.

3. In a lock the combination cfa cylindrical housing, having a base-plate, a bolt-cylinder mounted on said base-plate and superposed bit-operating cylinders, revolubly mounted in said casing, a key, having separable bit, comprising a fixed section fast on the keyshaft and other sections pivotally attached thereto, and longitudinally movable thereon, means for locking said sections together, and means in connection with the lock-cylinder for unlocking said sections and for moving same, with the exception of the iixed section, longitudinally on the shaft when the key is forced into the lock and turned therein and means in connection with the base-plate of the lock-housing for releasing the bolt-cylinder when the key has been turned home and means in connection with the lock-cylinders for relooking the bit-sections together, before the key has left the lock, substantially as described.

al. The combinat-ion of a lock, having cylindrical housingand the base-plate iiXed therein, a bolt-cylinder and su pel-posed lock-cylinders, revolubly mounted on said base-plate and means for locking said bolt-cylinder to said base-plate, a key having separable bit, one section of which is fast on said key-shaft and twosectionsof which are revolublymounted thereon, a latch pivotally mounted to the middle bit-section, and having formed at its end a series of fingers, a housing on the lower section to conceal said fingers and means for locking said three sections together, a series of sliding tumblers mounted in the lower locking-cylinder and' means in connection with the upper lockingcylinder, for tripping said latch, means in connection with the bolt-cylinder for disengaging the lower bit-section and operating the fingers of the same against said tumblers to permit movement of said upper cylinder on said lower cylinder, an orifice in said lower cylinder for the passage therethrough of the fixed key-bit, means for unlocking the ixed section of the bit and the revoluble section thereunder, a series of bolts mounted in the base plate and springs to press same upwardly a series of sliding bolts, to operate said detent-bolts and a series of depressions in the under side of the said fixed section, vto engage said sliding bolts and depress same, when the key has been forced into the lock and-the bit-sections of the same have been detached and means in connection with theilock-cylinders for relooking the bitsections, before the key has left the lock, su bstantially as described.

5. The combination of a cylindrical lockcasing having a base-plate and a bolt-cylinder and superposed lock-cylinders mounted therein, a series of bolts, spring-mounted in said base-plate, to engage said bolt-cylinder, a key having a separable bit comprising three sections, one of which is fixed to the key-shaft and two of which are revoluble and longitudinally movable thereon, means in connection with said fixed bit, to depress the detent-bolts of the base-plate, a series of sliding bolts, mounted in the lower section of said bit, a scries of spring-pressed bolts, mounted in the intermediate bit-section, anda spring-pressed bolt, to connect said upper and intermediate section, when the three sections are interlocked, a series of sliding tumblers mounted in the intermediate lock-cylinder and adapted to couple same to the upper lock-cylinder, a latch pivoted to the intermediate key-section and having lingers to operate said tumblers, means in connection with the upper lock-cylinder to trip said latch, means in connection with the bolt-cylinder to unlock the lower bolt-section and means in connection therewith to release the lock-bolt between the upper and intermediate bit-section, after said latch has been tripped and means for relooking the key before the same is withdrawn from the lock, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EMERICH VON MARSVSZKY.

Witnesses:

ALEXANDER ARRGONZ, PAUL BOTUKEY. 

